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gct.go
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gct.go
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// Package gct contains initialization for Google Cloud Trace opentracing.Tracer.
package tracing
import (
"context"
"fmt"
"cloud.google.com/go/trace/apiv1"
"github.com/go-kit/kit/log"
"github.com/go-kit/kit/log/level"
"github.com/lovoo/gcloud-opentracing"
"github.com/opentracing/basictracer-go"
"github.com/opentracing/opentracing-go"
)
type gcloudRecorderLogger struct {
logger log.Logger
}
func (l *gcloudRecorderLogger) Infof(format string, args ...interface{}) {
level.Info(l.logger).Log("msg", fmt.Sprintf(format, args...))
}
func (l *gcloudRecorderLogger) Errorf(format string, args ...interface{}) {
level.Error(l.logger).Log("msg", fmt.Sprintf(format, args...))
}
// NewOptionalGCloudTracer returns GoogleCloudTracer Tracer. In case of error it log warning and returns noop tracer.
func NewOptionalGCloudTracer(ctx context.Context, logger log.Logger, gcloudTraceProjectID string, sampleFactor uint64, debugName string) (opentracing.Tracer, func() error) {
if gcloudTraceProjectID == "" {
return &opentracing.NoopTracer{}, func() error { return nil }
}
tracer, closeFn, err := newGCloudTracer(ctx, logger, gcloudTraceProjectID, sampleFactor, debugName)
if err != nil {
level.Warn(logger).Log("msg", "failed to init Google Cloud Tracer. Tracing will be disabled", "err", err)
return &opentracing.NoopTracer{}, func() error { return nil }
}
level.Info(logger).Log("msg", "initiated Google Cloud Tracer. Tracing will be enabled", "err", err)
return tracer, closeFn
}
func newGCloudTracer(ctx context.Context, logger log.Logger, gcloudTraceProjectID string, sampleFactor uint64, debugName string) (opentracing.Tracer, func() error, error) {
traceClient, err := trace.NewClient(ctx)
if err != nil {
return nil, nil, err
}
r, err := gcloudtracer.NewRecorder(
ctx,
gcloudTraceProjectID,
traceClient,
gcloudtracer.WithLogger(&gcloudRecorderLogger{logger: logger}))
if err != nil {
return nil, traceClient.Close, err
}
shouldSample := func(traceID uint64) bool {
// Set the sampling rate.
return traceID%sampleFactor == 0
}
if sampleFactor < 1 {
level.Debug(logger).Log("msg", "Tracing is enabled, but sampling is 0 which means only spans with 'force tracing' baggage will enable tracing.")
shouldSample = func(_ uint64) bool {
return false
}
}
return &tracer{
debugName: debugName,
wrapped: basictracer.NewWithOptions(basictracer.Options{
ShouldSample: shouldSample,
Recorder: &forceRecorder{wrapped: r},
MaxLogsPerSpan: 100,
}),
}, r.Close, nil
}